Vertical axis hermetic helical screw rotary compressor with discharge gas oil mist eliminator and dual transfer tube manifold for supplying liquid refrigerant and refrigerant vapor to the compression
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
F04B-039/02
F04B-039/06
F04C-018/107
F25B-041/00
출원번호
US-0619237
(1984-06-11)
발명자
/ 주소
Schaefer, Donald D.
출원인 / 주소
Dunham-Bush, Inc.
대리인 / 주소
Sughrue, Mion, Zinn, Macpeak, and Seas
인용정보
피인용 횟수 :
41인용 특허 :
2
초록▼
A vertical axis hermetic compressor includes an inner cylindrical housing fixed internally of a sealed outer enclosure bearing paired helical screw rotors defining with the inner housing closed thread compressor compression chambers. An electrical drive motor overlies the rotors and is shaft connect
A vertical axis hermetic compressor includes an inner cylindrical housing fixed internally of a sealed outer enclosure bearing paired helical screw rotors defining with the inner housing closed thread compressor compression chambers. An electrical drive motor overlies the rotors and is shaft connected to one of the rotors. Compressed refrigerant vapor, where refrigerant is the working fluid, discharges through the motor rotor. A deflector within the top of the outer enclosure such that oil impacted by gas flow discharging axially from the motor adheres to the deflector to provide oil separation. Oil dropping from the deflector into the bottom of the outer enclosure functioning as an oil sump impacts against a two passage parallel flow dual transfer tube including one passage supplying liquid refrigerant from the condenser to the compressor working space for cooling the same through a liquid injection port and within a second passage, intermediate pressure refrigerant vapor injected into the compression process through a vapor injection port. This prevents excessive heating of the working fluid pulsing in the tubes during compression with control valves in the passages leading to the liquid injection and vapor injection ports closed.
대표청구항▼
1. In a vertical axis hermetic helical screw rotary compressor comprising: a closed vertical axis cylindrical outer enclosure, an inner cylindrical casing of a diameter less than that of said outer enclosure, means for coaxially fixedly mounting said inner cylindrical casing within said outer e
1. In a vertical axis hermetic helical screw rotary compressor comprising: a closed vertical axis cylindrical outer enclosure, an inner cylindrical casing of a diameter less than that of said outer enclosure, means for coaxially fixedly mounting said inner cylindrical casing within said outer enclosure, said inner cylndrical casing including transverse wall means separating said inner cylindrical casing into upper and lower chambers, a pair of vertical axis, laterally intersecting bores formed within said inner casing, intermeshed helical screw rotors within respective bores and forming with the bores a compressor working chamber, an inlet tube opening to said casing bores and said compression chamber at the upper end of said intermeshed helical screw rotors for supplying low pressure working fluid to said compressor, an electrical drive motor, said motor including a stator and a rotor, said motor rotor being coaxially mounted to the upper end of one of said helical screw rotors and said stator concentrically surrounding said rotor and being fixedly mounted to said inner casing within said upper chamber, means defining a compressor discharge passage within said inner casing for directing high pressure discharge gas from said compressor working chamber upwardly, fluid passage means within said electric drive motor rotor, oil within said outer enclosure collecting by gravity within the bottom thereof which functions as an oil sump, means for supplying oil to the rotating parts of the compressor from said sump at the discharge pressure of the compressor and being entrained in the compressor discharge such that; oil separates from the working fluid by centrifugal force due to rotation of the drive motor rotor and falls by gravity back into the sump; a liquid refrigerant injection port formed within said inner cylindrical casing and opening to said compressor working chamber, a vapor injection port carried by said inner cylindrical casing and opening to said working chamber at a point displaced from the liquid refrigerant injection port, said working fluid comprising a refrigerant, and means for supplying liquid refrigerant at compressor discharge pressure to said liquid injection port, and for supplying refrigerant in vapor form at a pressure intermediate of the suction and discharge pressure of the compressor to said vapor injection port, and wherein said supply means comprise separate lines for said liquid refrigerant and said vapor at intermediate pressure and includes control valves exterior of the cylindrical outer enclosure within the lines and acting to close off selectively supply lines leading to said liquid refrigerant injection port and said vapor injection port, the improvement wherein; said supply means comprises a dual transfer tube manifold assembly projecting inwardly of the cylindrical outer enclosure and being sealably and fixedly mounted thereto and spanning across the space between the cylindrical outer enclosure and the inner cylindrical casing and being of heat conductive material and bearing elongated parallel passages for said liquid refrigerant and said intermediate pressure vapor and being in fluid communication at their inboard ends with said liquid refrigerant injection port and said vapor injection port, respectively, whereby, when the control valves of said supply means are closed, working fluid pulsing back and forth within one of said parallel passages may be cooled by continued flow of injection fluid within the other of said parallel passages to thereby prevent excessive heat build up within the supply means injection passages leading from the cylindrical outer enclosure, and wherein, irrespective of injection fluid flow through said passages, said dual transfer tube assembly is cooled by drops of oil separated from the working fluid above the level of said dual transfer tube assembly and falling by gravity towards the accumulated oil within the sump and impacting on said dual transfer tube assembly. 2. The vertical axis hermetic helical screw rotary compressor as claimed in claim 1, wherein said inner cylindrical casing includes a vertical axis hole extending parallel to said intersecting bores bearing said helical screw rotors, being closed off at its lower end and terminating in a right angle extension portion opening to said compression chamber to define said vapor refrigerant injection port, and wherein said inner cylindrical casing further includes a horizontal hole extending radially through said casing and terminating in a liquid refrigerant injection port open to said compression chamber and intersecting said vertical axis hole, and wherein said dual transfer tube manifold assembly comprises a cylindrical manifold body of a diameter on the order of said horizontal hole, being sealably mounted therein and extending axially beyond the cylindrical outer enclosure and terminating in a radially enlarged head, first and second parallel bores extending lengthwise through said cylindrical manifold body and constituting said parallel passages, said first bore terminating in a right angle portion opening radially through the side of said cylindrical body and coinciding with said vertical axis hole within said inner cylindrical casing and functioning to supply vapor refrigerant for vapor refrigerant injection at said vapor refrigerant injection port, said second bore being radially enlarged at its end remote from said cylindrical outer enclosure so as to correspond to the diameter of the liquid injection port and being closed off at its other end, and radial passages within said head opening to said first and second bores and being at diametrically opposite sides forming inlets to said first and second parallel bores and functioning to supply intermediate pressure vapor refrigerant and liquid refrigerant at higher pressure for injection purposes.
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